The Israeli government aren't buying F-35 because they get to build some wings for the F-35A! That's like saying I need this particular type of gun because ..... you'll etch my name on it for a discount?!!
Ask why the gun is different, why you need the gun and what you intend to shoot with it if pressed. The gun seamlessly talks to a lot of other guns too? That could be interesting..... You'll buy them for me as well? Awesome.
I'm sure if the US were willing to sell an F/A-22 derivative to Israel they wouldn't be in the F-35 Program. That goes for a lot of other countries, like Japan.